Pyroelectric study of polarization switching in Langmuir-Blodgett films of poly(vinylidene fluoride trifluoroethylene)

Abstract

The ferroelectric switching in Langmuir-Blodgett films of poly͑vinylidene fluoride trifluoroethylene͒ is studied. The films have a distribution of switching times several decades wide. Nearly a half of the film volume may be switched faster than 1 ms, though complete switching of a whole sample may require 100 s or more. The switching occurs through a domain nucleation and growth mechanism. The decay of polarization at zero bias is logarithmic in time, with a constant rate below 5% per decade at room temperatures. The coercive voltage may be as low as 5 V, which makes the films promising for use in nonvolatile random-access data storage.

Polarization imaging in ferroelectric polymer thin film capacitors by pyroelectric scanning microscopy

“…[20][21][22][23] PSM has also been used to image domains 14,24 thermally written polarization patterns, [25][26][27][28] and to follow polarization and domain dynamics. [29][30][31][32] Moreover, 3D polarization information can be obtained from crystals and thick films by combining 2D laser scanning with depth profiles obtained using either pulse time-of-flight methods, 33 or Laser Intensity Modulation Method (LIMM), [34][35][36][37][38] or both. 39 One key advantage of PSM over techniques based on atomic force microscopy (AFM) is that the optical probe is noninvasive and does not damage or alter the sample.…”

Ferroelectric Control of Magnetic Anisotropy

“…Note that for the Co/Pt sample, we present results both at ferroelectric remanence, with zero applied voltage, and with an applied voltage of 12 V. The slightly larger changes seen with the voltage on are attributed to the relaxation of the ferroelectric polarization when the voltage is turned off. 23 (iii) The changes in the out-ofplane coercivity are most pronounced in the region of the spin reorientation transition. In contrast, the changes in the in-plane coercivity are minimized at or close to the SRT.…”

Preparation and Pyroelectric Properties of Poly(pentafluorostyrene)‐r‐Poly(4‐vinylaniline) Copolymer Films

“…In particular, its piezo-and pyroelectric properties provide possibilities in many technological applications. The poly(vinylidene fluoride)-ran-poly(trifluoroethylene) [PVDF-r-PTrFE)] copolymer has been used as a ferroelectric polymer due to its good piezoelectric and pyroelectric properties, [2][3][4] and has attract more and more attention recently. [5][6] However, as is known, the processability of PVDF is so poor that it limits their practical applications, so methods to improve the processability, and to reform the pyroelectric properties of fluorinated polymer pyroelectric materials in general, are challenging materials research topics.…”